BACKGROUND AND BASIS OF PRESENTATION (Details) - 3 months ended Jun. 30, 2015 - USD ($) $ / shares in Units, $ in Thousands	Total
BACKGROUND AND BASIS OF PRESENTATION [Abstract]
Foreign income tax adjustment	$ 1,313
Diluted earnings per share effect of foreign income tax adjustment	$ 0.05

Dilutive earnings per share effect of income tax expense related to foreign tax adjustment.

No definition available.

Name:	ccmp_DilutedEarningsPerShareEffectOfForeignIncomeTaxAdjustment
Namespace Prefix:	ccmp_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration